Butyl rubber (IIR)

Description

1. Product Overview
Butyl Rubber (IIR) is a synthetic elastomer produced via cationic copolymerization of isobutylene with isoprene, renowned for its exceptionally low gas permeability and superior damping properties. Its primary industrial use lies in manufacturing inner tubes, tire inner liners, pharmaceutical stoppers, and high-performance adhesives. The key value proposition is unmatched air retention and chemical resistance, directly reducing product failure rates and extending service life. Strategically, IIR is critical for industries requiring hermetic sealing, making it an indispensable material in automotive, medical, and industrial sealing applications worldwide.

2. Key Specifications & Technical Characteristics

• Chemical composition: Poly(isobutylene-co-isoprene), ≥98% isobutylene content

• Purity level: Standard grade (99.5% min.) and pharmaceutical grade available

• Physical characteristics:

  • Form: White to off-white bales or sheets

  • Color: Light cream

  • Mooney viscosity (ML 1+8 at 125°C): 46–56 MU (customizable)

  • Density: Approx. 0.92 g/cm³

• Packaging options: 25 kg compressed bales in PE-lined cartons; 1,200 kg shrink-wrapped pallets; containerized bale packing (20 MT per 40’ HC)

• Shelf life: 24 months when stored below 30°C, away from direct sunlight, ozone, and heat sources

3. Core Industrial Applications

• Automotive & tire manufacturing: Inner liners for tubeless tires (reduces pressure loss by 85–90% vs. natural rubber) and curing bladders. Outperforms NR or SBR in air retention and heat aging.

• Pharmaceutical packaging: Rubber stoppers for vials and syringe plungers. Superior chemical inertness prevents drug interaction and leaching, exceeding ISO 8871 requirements.

• Adhesives & sealants: Pressure-sensitive tapes, window sealants, and roofing membranes. Exceptional resistance to oxygen, UV, and acids extends outdoor durability by 3–5x compared to conventional elastomers.

• Industrial membranes: Vapor barriers and pond liners. Lowest moisture vapor transmission rate among all rubbers.

4. Competitive Advantages

• Quality consistency: Produced under ISO 9001:2021 and IATF 16949 certified processes; batch-to-batch Mooney viscosity variance < ±2 units.

• Supply reliability: Multi-source manufacturing (Americas, EMEA, Asia) with safety stock warehousing in key logistics hubs (Rotterdam, Houston, Shanghai).

• Logistics capability: Expedited LCL and full-container load (FCL) shipments with real-time tracking and incoterms support (EXW, FOB, CIF, DAP).

• Price competitiveness: Long-term mining-indexed pricing available; volume discounts for >100 MT/month contracts.

• Sustainability: Recycled butyl content options (up to 30%) and carbon-neutral shipping programs.

• Technical support: Full TDS, MSDS, and compatibility databases; on-call application engineering for curing optimization.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 20 MT (bulk industrial orders)

• Loading capacity (MT per container):

  • 20’ standard container: 16 MT (max)

  • 40’ HC container: 20 MT (optimized bale stacking)

  • Flexitank / bulk container not applicable — solid bales only